Generate all combinations of matrix for given vectors of column

I have 2 vectors a & b. Assume a = 1 : 1 : 10 & b = 100 : 100 : 1000. Required matrix of the form 10 x 2. Each row consists of 2 rows namely, a & b. Here I would like to generate all combinations of matrices.

Example, x1 = [ 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100 ]

x2 = [ 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 200 ]

x3 = [ 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 300 ]

.

.

.

x10 = [ 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 1000 ]

x11 = [ 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 2 100 ]

x12 = [ 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 1 100; 2 200 ]

Like wise code has to generate 10 ^20 matrices one by one, so that i don't want store these matrices in memory. I will use generated matrix and use it for my computation and generate next matrix.

[Stephen23]

Duplicate with answers:

https://www.mathworks.com/matlabcentral/answers/1615130-generating-matrix-of-all-possible-combination